Patents by Inventor Koichiro Fukuda

Koichiro Fukuda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Air fuel ratio control apparatus for an internal combustion engine
    Patent number: 6932069
    Abstract: An air fuel ratio control apparatus for an internal combustion engine can improve learning accuracy in the air fuel ratio control even if the air fuel ratio of a mixture detected by an air fuel ratio detection device shifts from an actual air fuel ratio thereof. The apparatus controls the air fuel ratio of an exhaust gas flowing into an exhaust gas purification device based on an air fuel ratio feedback value and an air fuel ratio learning value. A temperature detection device detects the temperature of the exhaust gas purification device. A determination device determines, based on a difference between a detection value of the temperature detection device and a target temperature, that the air fuel ratio detection device shifts to a rich or lean side. The update of the air fuel ratio learning value is inhibited when the air fuel ratio detection device shifts to a rich or lean side.
    Type: Grant
    Filed: October 4, 2004
    Date of Patent: August 23, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kingo Suyama, Koichiro Fukuda
  • Air fuel ratio control apparatus for an internal combustion engine
    Publication number: 20050076635
    Abstract: An air fuel ratio control apparatus for an internal combustion engine can improve learning accuracy in the air fuel ratio control even if the air fuel ratio of a mixture detected by an air fuel ratio detection device shifts from an actual air fuel ratio thereof. The apparatus controls the air fuel ratio of an exhaust gas flowing into an exhaust gas purification device based on an air fuel ratio feedback value and an air fuel ratio learning value. A temperature detection device detects the temperature of the exhaust gas purification device. A determination device determines, based on a difference between a detection value of the temperature detection device and a target temperature, that the air fuel ratio detection device shifts to a rich or lean side. The update of the air fuel ratio learning value is inhibited when the air fuel ratio detection device shifts to a rich or lean side.
    Type: Application
    Filed: October 4, 2004
    Publication date: April 14, 2005
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kingo Suyama, Koichiro Fukuda